A working reference for the vocabulary of digital marketing and growth — organized by channel and discipline. Definitions are written for practitioners, founders, and analysts who move fast and need the concepts straight. Acquisition and Channels CAC (Customer Acquisition Cost) The total cost of acquiring a new customer — all sales and marketing spend divided by the number of new customers acquired in the same period. CAC is the fundamental unit economics metric on the cost side.

A good shopping review doesn’t start with a product—it starts with a scene. The image here captures a narrow cobblestone street, probably somewhere Southern European, the kind of place where storefronts feel like part of the sidewalk rather than separate from it. Two young people walk toward the camera, centered almost perfectly, holding hands with that casual, unposed energy that makes the frame feel alive rather than staged. The guy wears a loose black short-sleeve button-up shirt printed with grayscale portraits, layered over a light undershirt, paired with relaxed beige trousers and chunky black sneakers.